Construction of boats&#39; davits



Aug. 14, 1923. mmmzas G. RINESI GONSTRUCTION OF BOATS DAVITS Filed May 28. 1921 enema Aug. 14, 1923.

GIOVANNI RINESI,

PATENT QH 'FTQEG OF GENOA, ITALY.

CONSTRUCTION OF BOATS DAVITS.

Application filed. May 28,

T aZZ whom it may concern:

Be it known that I, GIOVANNI RINEsI, a

subject of the King of Italy, and residing at Genoa, Italy, have invented certain new and useful Improvements in or Relating to the Construction of Boats Davits, of which the following is a specification. V

The type of davits proposed, as illustrated in the accompanying drawing, relates to improvements having the following peculiar features:

(l) The davit has a sector A the shape of which in its lower part is of an elliptic are a, b, c.

(2) When the davit is swung over, this elliptic arc comes in contact with a fixed supporting surface a, b, 0, whose radius of curvature is in every point different and varying in accordance with the law followed by a curve called Delaunay, from the name of its inventor.

Referring to the drawing:

Figure 1 is a side view of the improved davitdiagrammatically illustrating the manner of its use.

Figure 2 is an end view of the same.

The purpose of this arrangement is to put the davit in condition of rolling without sliding on the contact between the movable are a, b, 0, and the fixed are a 0 while the horizontal pivot of the davit is shifting itself on a straight line which coincides with the axis of the manoeuvring screw.

By this arrangement any friction is made impossible at the point of contact between the two arcs, and the working of the screw is made easier.

If'the fulcrum (horizontal pivot) of the davit is running on the path A, the are a, E)

0, covers by successive contact the segment a, b 0 of the fixed supporting guide.

, The teeth] represented in the drawings are not strictly necessary, being provided merely 1921. Serial No. 473,302.

to exclude any possibility of undue sliding.

Notwithstanding they are only safety means and normally they will never come in action.

The distance between the davit centralpivot (fulcrum) and the initial point of the contact with the fixed sec-tor reaches its maximum, B, when the boat is totally swung over and then the resistance moment also reaches its maximum value. 7

The distance 0 between the lever fulcrum and one of the foci of the ellipse can be more or less great in accordance with other principal dimensions of the davit supportframinc and is to be chosen so as to have not a too great inclination of the initial tangent of the path of rolling.

The angle or is normally of degrees.

The annexed drawing shows a davit totally of cast steel, but, of course, the 'da-vits and its base-framing could be also built up of plates and angles.

Other changes are possible by using forged iron, without altering the cinematic arrangement.

Having now particularly described and ascertained the nature of my said invention and in what manner the same is to be per formed, I declare that what 1 claim is Boats quadrant davit having an elliptical sector rolling without sliding on a fixed sec tor of special profile corresponding to that of the geometrical curve called Delaunay, while the fulcrum of the davit is shifiing itself on a straight line.

In testimony whereof I have hereunto signed my name in the presence of two witnesses.

GIOVANNI RINESI.

/Vitnesses TIYCTITINE DRIN, AUGUST DE MARTINI. 

